﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Net.NetworkInformation;
using System.Net;
using System.Management;

namespace MessageCommon
{
    public class GlobalFunc
    {
        /// <summary>
        /// 获取本地IPv4地址
        /// </summary>
        /// <returns></returns>
        public static string GetLocalIP()
        {
            string hostName = System.Net.Dns.GetHostName();//本机名   
            System.Net.IPAddress[] addressList = System.Net.Dns.GetHostAddresses(hostName);
            foreach (System.Net.IPAddress ip in addressList)
            {
                if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                {
                    return ip.ToString();
                }
            }

            return string.Empty;
        }

        /// <summary>
        /// 获取第一个可用的端口号
        /// </summary>
        /// <returns></returns>
        public static int GetFirstAvailablePort()
        {
            int MAX_PORT = 20000; //系统tcp/udp端口数最大是65535            
            int BEGIN_PORT = 1024;//从这个端口开始检测

            for (int i = MAX_PORT; i > BEGIN_PORT; i--)
            {
                if (PortIsAvailable(i)) return i;
            }

            return -1;
        }

        /// <summary>
        /// 检查指定端口是否已用
        /// </summary>
        /// <param name="port"></param>
        /// <returns></returns>
        public static bool PortIsAvailable(int port)
        {
            bool isAvailable = true;

            IList portUsed = PortIsUsed();

            foreach (int p in portUsed)
            {
                if (p == port)
                {
                    isAvailable = false; break;
                }
            }

            return isAvailable;
        }

        /// <summary>
        /// 获取操作系统已用的端口号
        /// </summary>
        /// <returns></returns>
        public static IList PortIsUsed()
        {
            //获取本地计算机的网络连接和通信统计数据的信息
            IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();

            //返回本地计算机上的所有Tcp监听程序
            IPEndPoint[] ipsTCP = ipGlobalProperties.GetActiveTcpListeners();

            //返回本地计算机上的所有UDP监听程序
            IPEndPoint[] ipsUDP = ipGlobalProperties.GetActiveUdpListeners();

            //返回本地计算机上的Internet协议版本4(IPV4 传输控制协议(TCP)连接的信息。
            TcpConnectionInformation[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpConnections();

            IList allPorts = new ArrayList();
            foreach (IPEndPoint ep in ipsTCP) allPorts.Add(ep.Port);
            foreach (IPEndPoint ep in ipsUDP) allPorts.Add(ep.Port);
            foreach (TcpConnectionInformation conn in tcpConnInfoArray) allPorts.Add(conn.LocalEndPoint.Port);

            return allPorts;
        }

        //获得CPU的序列号
        public static string GetCpuSerialNum()
        {
            string strCpu = null;
            ManagementClass myCpu = new ManagementClass(GlobalConst.WIN2_PROCESSOR);
            ManagementObjectCollection myCpuConnection = myCpu.GetInstances();
            foreach (ManagementObject myObject in myCpuConnection)
            {
                strCpu = myObject.Properties[GlobalConst.PROCESSORID].Value.ToString();
                break;
            }
            return strCpu;
        }

    }
}
